SU659864A1 - Granulating dryer - Google Patents

Description

transporting the retour to the head of the drum from the tail. At the end of the blade nozzle there is a restrictive ring 8, which is necessary for the speed-less classification of the teno-agent moving inside the drum. In order to carry out the pneumatic classification of the retura, a row of blades 9 is located in front of the restriction ring. For a more subtle classification, the volume of the scooping blades and their angle of inclination must be chosen so that the product is expelled only from the central zone of the apparatus.

Behind the diaphragm, there are two elevator rings 10 and 11, forming compartments 12 and 13 for collecting the product after pneumatic classification. A movable cylinder 14 is provided in the apparatus, which serves for the primary collection of the fines fraction and transporting it to compartment 13, where it is conveyed back to the head of the annarat by a return screw. In compartment 12 there is a straight box screw 15 for removing the finished product from the drum. Both forward and reverse augers are cross-linked.

Pellet torus dryer works as follows.

When the drum is rotated, the lift-blade nozzle 6 creates inside the drum a curtain of granulated material onto which pulp is sprayed from the pneumatic nozzle 4. Moving along the axis of the drum due to the rotation of the heat agent flow and the angle of inclination, the material is granulated, dried with tenloagent and supplied to the blades 9. During the drying process, the reverse screw 7 exposes the material to intensive circulation, thereby producing a narrow granular composition.

Dumping blades 9 in the zone of increased tenloagent velocity created by the restrictive ring, the product is classified according to the grain size distribution. In the event of a fall from the blades 9, the small granules iodine are impacted into the movable cylinder 14, which feeds them into the compartment 13, from where they are moved to the head of the drum with the return screw 7, and they are again included in the process.

A larger fraction, corresponding in size to the finished product, when falling from the blades 9 under the influence of the velocity head of the thermal agent deviates slightly and enters the compartment 12,

formed by a limiting ring 8 and a front end of the cylinder 14, from where a straight box screw 15 is led out of the drum. Thus, in a pellet drier

a closed cycle of product movement is created: a fine fraction is continuously returned to the head, and only the finished product is removed from the apparatus. Internal circulation also significantly intensifies the drying process by increasing the average temperature of the product at the head of the apparatus.

Claims (1)

Invention Formula Pneumatic dryer with pneumatic classification of materials, a rotating drum with blades fixed on its inner surface for mixing the material, installed at one end of the drum nozzle, located along its length a return hollow screw for transporting the retour, classifier and discharge chamber, characterized by that, in order to intensify the processes of granulation and classification, the classifier is made in the form of successively installed restrictive ring with blades and support rings forming the compartments on the side of the nozzle, and a movable cylinder is fixed on the ring separating the compartments, and in the first compartment along the material a straight hollow auger connected to the discharge chamber is additionally installed. Sources of information taken into account during the examination 1. USSR author's certificate No. 522391, cl. F 26B 17/32, 1971.